uh, in california alone, it is the number one crop. >> and there's at least 13 gardens within a mile radius of our home. >> thirteen gardens right around your house? >> mmm-hmm. >> yes. >> wow! >> thousands of growers, millions of users, and a market in the billions. >> how much money was coming in to your marijuana smuggling operations every year? >> about 50 million. >> it's a multi-billion dollar business rife with guns, gangs, and plenty of money. i'm trish regan. join me for an unprecedented look inside america's marijuana industry.